Report on Proposals June 2013 NFPA 70

Transcription

1 14-1 Log #1170m NEC-P14 Russell LeBlanc, The Peterson School In articles 90 through 830, if the wording is not already there, then add the words (or other structure(s)) after the word BUILDING(S) wherever the intent of the requirement is to also include STRUCTURES as well as buildings. There is a flaw in the NEC. The term "building" is used over 1000 times in the NEC, and in most of the cases the words "or other structure" should follow and apply the same requirements to bridges, billboards, towers, tanks, and other structures that are by definition NOT BUILDINGS. One specific example I can use is section Wiring on Buildings. I believe that this section is also intended to be applied structures, but the wording "or other structures" is not in the heading or the paragraph. There are literally thousands of other instances throughout the code that this same problem exists. This can easily be seen by doing an electronic search for the word "building". In some cases the words "or other structure" (or similar wording) are present, but in the vast majority where the requirements should also be applied to structures other than buildings, the wording is not there. The submitter has not provided specific proposed text for his proposal in accordance with 4.3.3(c) of the Regulations Governing Committee Projects Log #921m NEC-P14 Joe Tedesco, Boston, MA The term "adequate" and "adequately" and "inadequately" and "inadequate" should be replaced with terms that can be properly enforced and understood. Terms are not defined and are considered vague and unenforceable per Table in the NEC Style Manaual. They are all "incorrect" 148 times in the NEC. The submitter has not provided specific proposed text for his proposal in accordance with 4.3.3(c) of the Regulations Governing Committee Projects. 1

2 14-3 Log #2638e NEC-P14 John R. Kovacik, Underwriters Laboratories Inc. Update the references to UL Standards in the Informational Notes as shown below: Equipment enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby. Informational Note: For further information, see ANSI/UL , For purposes of Articles 500 through 504 and Articles 510 through 516, the following definitions apply. Equipment enclosed in a manner that excludes dusts and does not permit arcs, sparks, or heat otherwise generated or liberated inside of the enclosure to cause ignition of exterior accumulations or atmospheric suspensions of a specified dust on or in the vicinity of the enclosure. Informational Note: For further information on dustignitionproof enclosures, see Type 9 enclosure in ANSI/NEMA ,, and ANSI/UL ,. Informational Note: For further information, see ANSI/UL ,. Informational Note No. 2: Female NPT threaded entries use a modified National Standard Pipe Taper (NPT) thread with thread form per ANSI/ASME B ,. See ANSI/UL ,. A circuit in which any spark or thermal effect is incapable of causing ignition of a mixture of flammable or combustible material in air under prescribed test conditions. Informational Note: Test conditions are described in ANSI/UL ,. For purposes of this article, the following definitions apply. Equipment enclosed in a manner that excludes dusts and does not permit arcs, sparks, or heat otherwise generated or liberated inside of the enclosure to cause ignition of exterior accumulations or atmospheric suspensions of a specified dust on or in the vicinity of the enclosure. Informational Note: For further information on dustignitionproof enclosures, see Type 9 enclosure in ANSI/NEMA ,, and ANSI/UL ,. References to UL Standards in the NEC should reflect the current edition. Accept all amendments to the publication dates of the referenced documents, but do not accept the deletion of "1203" in Informational Note 2 of 500.2(1). The panel notes that the submitter accidentally deleted the document number. 2

3 14-4 Log #1611 NEC-P14 James F. Williams, Fairmont, WV That portion of a property where liquids are received by tank vessel, pipelines, tank car, or tank vehicle and are stored or blended in bulk for the purpose of distributing such liquids by tank vessel, pipeline, tank car, tank vehicle, portable tank, or container. [ ] Informational Note: For further information, see NFPA ,. That portion of a property where liquids are received by tank vessel, pipelines, tank car, or tank vehicle and are stored or blended in bulk for the purpose of distributing such liquids by tank vessel, pipeline, tank car, tank vehicle, portable tank, or container. [ ] Informational Note: For further information, see NFPA ,. The defined term is referenced in several articles of the NEC:,,,,, & In general, Article 100 shall contain definitions of terms that appear in two or more other articles of the. The Tables cited in the submitter s substantiation contain references to Chapter 5 articles. The term bulk plant appears only in Article 515. The present location of the definition is correct. 3

4 14-5 Log #1609 NEC-P14 James F. Williams, Fairmont, WV Equipment with electrical components suitable to be moved only with mechanical aids or is provided with wheels for movement by person(s) or powered devices. Equipment with electrical components suitable to be moved by a single person without mechanical aids Equipment with electrical components suitable to be moved only with mechanical aids or is provided with wheels for movement by person(s) or powered devices. Equipment with electrical components suitable to be moved by a single person without mechanical aids The defined term is referenced in several articles of the NEC:,,,,,,,,,,, (3),,,,,,, (2),, 513.2, & 513.,,, (8),,,,,, (1), (5),,, (6),,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, & In general, Article 100 shall contain definitions of terms that appear in two or more other articles of the. The submitter did not provide substantiation to support the correctness of the proposed definitions. This is not in accordance with 4.3.3(d) of the Regulations Governing Committee Projects. Panel 14 also notes that portable and movable vary from product to product, and are defined in the various product standards. 4

5 14-6 Log #1610 NEC-P14 James F. Williams, Fairmont, WV That portion of a property where motor fuels are stored and dispensed from fixed equipment into the fuel tanks of motor vehicles or marine craft or into approved containers, including all equipment used in connection therewith. [ ] Informational Note: Refer to Articles 510 and 511 with respect to electrical wiring and equipment for other areas used as lubritoriums, service rooms, repair rooms, offices, salesrooms, compressor rooms, and similar locations. That portion of a property where motor fuels are stored and dispensed from fixed equipment into the fuel tanks of motor vehicles or marine craft or into approved containers, including all equipment used in connection therewith. [ ] Informational Note: Refer to Articles 510 and 511 with respect to electrical wiring and equipment for other areas used as lubritoriums, service rooms, repair rooms, offices, salesrooms, compressor rooms, and similar locations. The defined term is referenced in several articles of the NEC:,,,,,,,,,, & In general, Article 100 shall contain definitions of terms that appear in two or more other articles of the. The Tables cited in the submitter s substantiation contain references to Chapter 5 articles. The term motor fuel dispensing facility appears only in Article 514. The present location of the definition is correct Log #2894 NEC-P14 James F. Williams, Fairmont, WV Equipment with electrical components intended to be moved from one place to another. Equipment with electrical components suitable to be moved by a single person without mechanical aids. The defined term is referenced in several articles of the NEC: 100 I Electric Sign, 110, 210, 250, 368, 400, 430, 490, 500, 501, 505, 511, 513, 514, 515, 516, 517, 518, 520, 525, 530, 545, 600, 640, 668, 680 It is defined in 513.2, 520.2, 530.2, 640.2, & Suggest that a single definition in 100 I is better. In general, Article 100 shall contain definitions of terms that appear in two or more other articles of the. The submitter did not provide substantiation to support the correctness of the proposed definition. This is not in accordance with 4.3.3(d) of the Regulations Governing Committee Projects. Panel 14 also notes that the meaning of portable varies from Article to Article. The panel notes that the proposed change in the definition would have unintended and unsubstantiated changes to the application of portable equipment in aircraft hangars. 5

6 14-8 Log #1612 NEC-P14 James F. Williams, Fairmont, WV An enclosure or insert within a larger room used for spray/coating/dipping applications. A spray booth may be fully enclosed or have open front or face and may include separate conveyor entrance and exit. The spray booth is provided with a dedicated ventilation exhaust but may draw supply air from the larger room or have a dedicated air supply. An enclosure or insert within a larger room used for spray/coating/dipping applications. A spray booth may be fully enclosed or have open front or face and may include separate conveyor entrance and exit. The spray booth is provided with a dedicated ventilation exhaust but may draw supply air from the larger room or have a dedicated air supply. The defined term is referenced in several articles of the NEC: (3)(2),, & In general, Article 100 shall contain definitions of terms that appear in two or more other articles of the. The citation of 500.5(B)(3) by the submitter in the substantiation is an Informational Note, not in the Code text. This does not justify moving the definition from Article 516 to Article 100, as Article 516 is the only Article containing provisions for spray booths. 6

7 14-9 Log #1999 NEC-P14 Eliana Brazda, ISA Add new text to read as follows: Electromagnetic radiation at wavelengths in vacuum between the region of transition to X-rays and the region of transition to radio waves, that is approximately between 1 nm and 1,000 ìm. Informational Note: For additional information on types of protection that can be applied to minimize the risk of ignition in explosive gas atmospheres from optical radiation in the wavelength range from 380 nm to 10 µm, see ANSI/ISA TR , Type of protection to minimize the risk of ignition in explosive gas atmospheres from optical radiation where visible or infrared radiation is incapable of producing sufficient energy under normal or specified fault conditions to ignite a specific hazardous atmospheric mixture. Informational Note: See ANSI/ISA TR , Type of protection to minimize the risk of ignition in explosive gas atmospheres from optical radiation where radiation is confined inside optical fibre or other transmission medium under normal constructions or constructions with additional mechanical protection based on the assumption that there is no escape of radiation from the confinement. Informational Note: See ANSI/ISA TR , Type of protection to minimize the risk of ignition in explosive gas atmospheres from optical radiation where radiation is confined inside protected or unprotected optical fibre or other transmission medium with interlock cut-off provided to reliably reduce the unconfined beam strength to safe levels within a specified time. Informational Note: See ANSI/ISA TR , Optical fibre cable protected from releasing optical radiation into the atmosphere during normal operating conditions and foreseeable malfunctions by additional armouring, conduit, cable tray or raceway. Informational Note: See ANSI/ISA TR , The 2011 edition of the NEC does not address the potential for optical radiation to cause ignition in an explosive atmosphere. It does address optical fiber cables, but not from the perspective of the potential to cause ignition. ANSI/ISA-TR ,, contains published US national requirements that address the potential risk of ignition associated with optical radiation in Division classified areas. This ANSI/ISA standard is aligned with harmonized with ANSI/ISA ( ),, and IEC/EN :2006,, for Zone classified areas. ANSI/ISA-TR defines three types of protection that can be applied to address the potential for optical radiation to cause ignition in potentially explosive atmospheres. These types of protection are: 1) inherently safe optical radiation; 2) protected optical radiation; and 3) optical system with interlock. This proposal introduces these types of protection, along with the general term optical radiation and one of the more common applications of optical radiation in explosive atmospheres, protected optical fiber cable. Additional proposals are being submitted to introduce related, supporting text under and It should be noted that the sources of the optical radiation are electrical equipment. Therefore this proposal is necessary for inclusion in the NEC. There is no need to define terms that are not used in the Code. 7

8 14-10 Log #2007 NEC-P14 Eliana Brazda, ISA Dusttight Informational Note: ANSI/ISA , ANSI/ISA , Electrical and Electronic Equipment: ISA-RP , ANSI/ISA ,. Hermetically Sealed Informational Note: ANSI/ISA , ANSI/ISA , Nonincendive Circuit Informational Note: ANSI/ISA , ANSI/ISA , Nonincendive Component Informational Note: ANSI/ISA , ANSI/ISA , Nonincendive Equipment Informational Note: ANSI/ISA ANSI/ISA , Nonincendive Field Wiring Apparatus Informational Note: ANSI/ISA , ANSI/ISA , Remove the ISA standards date of publication to allow application of all appropriate versions. Accept the changes proposed by the submitter, but include the appropriate publication dates of The two references will read: ANSI/ISA , and ANSI/ISA , Paragraph of the Regulations Governing Committee Projects requires dated references to Standards. The current publication dates for ISA and are

9 14-11 Log #1219 NEC-P14 Marcelo M. Hirschler, GBH International Apparatus in which the circuits are not necessarily nonincendive themselves but that affect the energy in nonincendive field wiring circuits and are relied upon to maintain nonincendive energy levels. Associated nonincendive field wiring apparatus may be either of the following: (1) Electrical apparatus that has an alternative type of protection for use in the appropriate hazardous (classified) location (2) Electrical apparatus not so protected that shall not be used in a hazardous (classified) location Associated nonincendive field wiring apparatus has designated associated nonincendive field wiring apparatus connections for nonincendive field wiring apparatus and may also have connections for other electrical apparatus. : Associated nonincendive field wiring apparatus may be either of the following: (1) Electrical apparatus that has an alternative type of protection for use in the appropriate hazardous (classified) location (2) Electrical apparatus not so protected that shall not be used in a hazardous (classified) location The NFPA Manual of Style requires definitions to be in single sentences. The information provided in the subsequent sentences is not really a part of the definition; it is further information that is best placed in an informational note. Paragraph of the NFPA Manual of Style does not require definitions in the form of a single sentence; it requires definitions in the form of a single paragraph unit. The NEC Style Manual does not modify this a Log #CP1411 NEC-P14 Code-Making Panel 14, In replace the current definition of Combustible Dust with the following: Combustible Dust. Dust particles of 500 microns or smaller (material passing a U.S. No. 35 Standard Sieve as defined in ASTM E 11, Standard Specification for Wire Cloth and Sieves for Testing Purposes) are considered to present a dust fire or dust explosion hazard unless determined otherwise. (See ASTM E 1226 or ISO 6184/1). [499:3.3.3] revised. Definition is extracted from NFPA 499 and the definition in the 2012 Edition of NFPA 499 has been 14-11b Log #CP1402 NEC-P14 Code-Making Panel 14, Add a new definition to 500.2, 505.2, and to read: Cord Connector. A fitting intended to terminate a cord to a box or similar device and reduce the strain at points of termination and may include an explosionproof, a dust ignition proof, or a flameproof seal. The existing term "cord connector" has different meanings in other places, which has caused confusion. The inclusion of this definition in these three articles makes it clear as to the meaning of the term as a mechanical device, not as an electrical device, and is based on the product standard ANSI/UL 514B. 9

10 14-12 Log #1220 NEC-P14 Marcelo M. Hirschler, GBH International A component having contacts for making or breaking an incendive circuit and the contacting mechanism is constructed so that the component is incapable of igniting the specified flammable gas air or vapor air mixture. The housing of a nonincendive component is not intended to exclude the flammable atmosphere or contain an explosion. For further information, see ANSI/ISA , : The housing of a nonincendive component is not intended to exclude the flammable atmosphere or contain an explosion. The NFPA Manual of Style requires definitions to be in single sentences. The information provided in the subsequent sentences is not really a part of the definition; it is further information that is best placed in an informational note. Paragraph of the NFPA Manual of Style does not require definitions in the form of a single sentence; it requires definitions in the form of a single paragraph unit. The NEC Style Manual does not modify this Log #1221 NEC-P14 Marcelo M. Hirschler, GBH International Wiring that enters or leaves an equipment enclosure and, under normal operating conditions of the equipment, is not capable, due to arcing or thermal effects, of igniting the flammable gas air, vapor air, or dust air mixture. Normal operation includes opening, shorting, or grounding the field wiring. : Normal operation includes opening, shorting, or grounding the field wiring. The NFPA Manual of Style requires definitions to be in single sentences. The information provided in the subsequent sentences is not really a part of the definition; it is further information that is best placed in an informational note. Paragraph of the NFPA Manual of Style does not require definitions in the form of a single sentence; it requires definitions in the form of a single paragraph unit. The NEC Style Manual does not modify this Log #3186 NEC-P14 Stephen Crimaudo, American Petroleum Institute Replace "1997" date reference to ANSI/API RP500 to "2012" as indicated below. ANSIAPI RP , I, This and the companion proposals propose to update the date references to ANSI/API RP 500. The latest edition of ANSI/API RP 500 has been approved for publication and is expected to be published by API in early The 2012 edition of the referenced document has not been published yet. 10

11 14-15 Log #3187 NEC-P14 Stephen Crimaudo, American Petroleum Institute Replace "1997" date reference to ANSI/API RP500 to "2012" as indicated below., Informational Note No. 4: For further information on ventilation, see NFPA , and API RP This and the companion proposals propose to update the date references to ANSI/API RP 500. The latest edition of ANSI/API RP 500 has been approved for publication and is expected to be published by API in early The 2012 edition of the referenced document has not been published yet a Log #CP1413 NEC-P14 Code-Making Panel 14, Classifications of Locations (A) Classifications of Locations. Locations shall be classified depending on the properties of the flammable gas, flammable liquid-produced vapor, combustible-liquid produced vapors, combustible dusts, or fibers/flyings that may be present, and the likelihood that a flammable or combustible concentration or quantity is present. Where pyrophoric materials are the only materials used or handled, these locations shall not be classified. Each room, section, or area shall be considered individually in determining its classification. Where pyrophoric materials are the only materials used or handled, these locations are outside the scope of this article. The language is being updated to be consistent with current language found in Section 506.5(A) and consistent with the fact that neither NFPA 497 or NFPA 499 currently address the use of pyrophoric materials. 11

12 14-16 Log #265 NEC-P14 Billy Breitkreutz, Fluor Corporation Add an Informational Note No. 3 to read as follows: Informational Note No. 3: Pyrophoric materials should be in containment systems designed to prevent contact between the pyrophoric material and air. The pyrophoric material might escape in very small amounts and combine with air at a level and temperature that would not cause spontaneous combustion. Ignition might be avoided if electrical equipment in the area is suitable for a classified location. Silane (SiH 4 ) is a pyrophoric gas that will not spontaneously ignite when mixed with air at a low level and temperature. Silane must be loaded into containers for transportation using a connection that might leak a very small quantity and mix with air at such a low level and temperature. Code Section 505.5(A) prohibits classification of the area. The Code does not prohibit installation of equipment suitable for a hazardous area in the non-hazardous area. The proposed change will make clear that installation of equipment suitable for a hazardous area in this non-hazardous is a recognized practice. The methods of protection identified in Articles 500, 505, and 506 do not provide a sufficient degree of protection for pyrophoric material. Pyrophoric materials are specifically excluded from the scopes of NFPA 497,., and NFPA 499, Log #2167 NEC-P14 Marcelo M. Hirschler, GBH International ASTM D3175: new date is 2011 Standards update. This is extracted text and cannot be altered by Panel Log #3188 NEC-P14 Stephen Crimaudo, American Petroleum Institute Change "ignition temperature" to "autoignition temperature". API RP 500, API RP 505, NFPA 497 and NFPA 499 define the term "Autoignition Temperature" or (AlT). The term "ignition temperature" is often used synonymously with autoignition temperature, but sometimes incorrectly. This proposal, along with its companion proposals, attempt to promote consistency of the terms between the standards. The term "autoignition temperature" is used when referring to the material property of flammable liquids and vapors, which is consistent with how the term is used in NFPA 497. The term "ignition temperature" is used when referring to the material property of combustible dusts, which is consistent with how the term is used in NFPA

13 14-19 Log #2689 NEC-P14 Jeremy Neagle, US Bureau of Alcohol, Tobacco, Firearms & Explosives Informational Note No. 3: Certain dusts may require additional precautions due to chemical phenomena that can result in the generation of ignitible gases. See ANSI/IEEE C ,, Section 127A, Coal Handling Areas. IEEE is the organization responsible for the development of the National Electrical Safety Code. The current edition is This document is referenced in various sections throughout the NEC as either ANSI C2 or ANSI/IEEE C2. I suggest the NEC Technical Correlating Committee review these sections (110.31, , 225.1, , , , , , 500.6, , , , , ) and update as appropriate. 13

14 14-20 Log #2000 NEC-P14 Eliana Brazda, ISA Add new text to read as follows: This protection technique shall be permitted for equipment in Class I, Division 1 or 2 locations, for which it is identified. The identified Division depends upon the number of faults applied as part of the protection technique evaluation. This protection technique shall be permitted for equipment in Class I, Division 1 or 2 locations, for which it is identified. The identified Division depends upon whether or not additional mechanical protection is provided as part of the protection technique evaluation. This protection technique shall be permitted for equipment in Class I, Division 1 or 2 locations, for which it is identified. The identified Division depends upon the confinement construction and upon the shut-down time in which the unconfined beam strength is reliably reduced to safe levels. The 2011 edition of the NEC does not address the potential for optical radiation to cause ignition in an explosive atmosphere. It does address optical fiber cables, but not from the perspective of the potential to cause ignition. ANSI/ISA-TR ,, contain published US national requirements that address the potential risk of ignition associated with optical radiation in Division classified areas. This ANSI/ISA standard is aligned with harmonized with ANSI/ISA ( ),, and IEC/EN :2006,, for Zone classified areas. ANSI/ISA-TR defines three types of protection that can be applied to address the potential for optical radiation to cause ignition in potentially explosive atmospheres. These types of protection are: 1) inherently safe optical radiation; 2) protected optical radiation; and 3) optical system with interlock. This proposal introduces these types of protection, along with the general term optical radiation and one of the more common applications of optical radiation in explosive atmospheres, protected optical fiber cable. Additional proposals are being submitted to introduce related, supporting text under and It should be noted that the sources of the optical radiation are electrical equipment. Therefore this proposal is necessary for inclusion in the NEC. The technical report referenced in the substantiation does not establish that the testing criteria provided are indicative of typical installations in hazardous (classified) locations and there is no evidence that existing equipment in use should be tested to these additional standards. 14

15 14-21 Log #1171 NEC-P14 Jon D. Miller, Detector Electronics Corp. Change the text to the following : (1) Inadequate Ventilation. In a Class I, Division 1 location that is so classified due to inadequate ventilation, electrical equipment suitable for Class I, Division 2 locations shall be permitted. Combustible gas detection equipment shall be listed for Class I, Division 1, for the appropriate material group, and for the detection of the specific gas or vapor to be encountered for which it is intended. ( 2) Interior of a Building. In a building located in, or with an opening into, a Class I, Division 2 location where the interior does not contain a source of flammable gas or vapor, electrical equipment for unclassified locations shall be permitted. Combustible gas detection equipment shall be listed for Class I, Division 1 or Class I, Division 2, for the appropriate material group, and for the detection of the specific gas or vapor to be encountered for which it is intended. ( 3) Interior of a Control Panel. In the interior of a control panel containing instrumentation utilizing or measuring flammable liquids, J gases, or vapors, electrical equipment suitable for Class I, Division 2 locations shall be permitted. Combustible gas detection equipment shall be listed for Class I, Division 1, for the appropriate material group, and for the detection of the specific gas or vapor to be encountered for which it is intended. The listing of the gas detector would include the gasses or vapors for which the detector is intended (not "encountered"). A Methane gas detector encounters Nitrogen (within air), but the Methane gas detector is not listed for Nitrogen. Gas detection equipment can be intended to detect, for example, a noncombustible gas or a combustible gas other than the one to be encountered, and that would not fulfill the requirements of using gas detection as a method of protection Log #3189 NEC-P14 Stephen Crimaudo, American Petroleum Institute Change "ignition temperature" to "autoignition temperature". API RP 500, API RP 505, NFPA 497 and NFPA 499 define the term "Autoignition Temperature" or (AlT). The term "ignition temperature" is often used synonymously with autoignition temperature, but sometimes incorrectly. This proposal, along with its companion proposals, attempt to promote consistency of the terms between the standards. The term "autoignition temperature" is used when referring to the material property of flammable liquids and vapors, which is consistent with how the term is used in NFPA 497. The term "ignition temperature" is used when referring to the material property of combustible dusts, which is consistent with how the term is used in NFPA 499. The more general term "ignition temperature" is appropriate here, since this section addresses gases, vapors, dusts, and fibers/flyings. 15

16 14-23 Log #3190 NEC-P14 Stephen Crimaudo, American Petroleum Institute Change "ignition temperature" to "autoignition temperature". API RP 500, API RP 505, NFPA 497 and NFPA 499 define the term "Autoignition Temperature" or (AlT). The term "ignition temperature" is often used synonymously with autoignition temperature, but sometimes incorrectly. This proposal, along with its companion proposals, attempt to promote consistency of the terms between the standards. The term "autoignition temperature" is used when referring to the material property of flammable liquids and vapors, which is consistent with how the term is used in NFPA 497. The term "ignition temperature" is used when referring to the material property of combustible dusts, which is consistent with how the term is used in NFPA Log #2056 NEC-P14 Edward M. Briesch, Underwriters Laboratories Inc. The marking shall specify the temperature class or operating temperature at a 40 C ambient temperature, or at the higher ambient temperature if the equipment is rated and marked for an ambient temperature of greater than 40 C. For equipment installed in a Class II, Division 1location, the temperature class or operating temperature shall be based on operation of the equipment when blanketed with dust. The temperature class, if provided, shall be indicated using the temperature class (T Codes) shown in Table 500.8(C). Equipment for Class I and Class II shall be marked with the maximum safe operating temperature, as determined by simultaneous exposure to the combinations of Class I and Class II conditions. The current text is not clear as to if this temperature is based on operation of the equipment in free air or when the equipment is blanketed with dust. In a Class II, Division 1 location, it would be expected that a dust blanket could exist under normal operating conditions. Equipment temperatures under a dust blanket will be considerably higher than in free air due to the insulating effect of the dust blanket and may very well exceed the ignition temperature of the dust when in free air they would not. The ANSI standards for the equipment, ANSI/UL1203 for example, require the temperature be determined with a dust blanket. The marking shall specify the temperature class or operating temperature at a 40 C ambient temperature, or at the higher ambient temperature if the equipment is rated and marked for an ambient temperature of greater than 40 C. For equipment installed in a Class II, Division 1 location, the temperature class or operating temperature shall be based on operation of the equipment when blanketed with the maximum amount of dust that can accumulate on the equipment. The temperature class, if provided, shall be indicated using the temperature class (T Codes) shown in Table 500.8(C). Equipment for Class I and Class II shall be marked with the maximum safe operating temperature, as determined by simultaneous exposure to the combinations of Class I and Class II conditions. The proposed text has been amended to provide a quantifiable measure of a blanket of dust. 16

17 14-25 Log #3191 NEC-P14 Stephen Crimaudo, American Petroleum Institute Change "ignition temperature" to "autoignition temperature". API RP 500, API RP 505, NFPA 497 and NFPA 499 define the term "Autoignition Temperature" or (AlT). The term "ignition temperature" is often used synonymously with autoignition temperature, but sometimes incorrectly. This proposal, along with its companion proposals, attempt to promote consistency of the terms between the standards. The term "autoignition temperature" is used when referring to the material property of flammable liquids and vapors, which is consistent with how the term is used in NFPA 497. The term "ignition temperature" is used when referring to the material property of combustible dusts, which is consistent with how the term is used in NFPA Log #3192 NEC-P14 Stephen Crimaudo, American Petroleum Institute Change "ignition temperature" to "autoignition temperature". API RP 500, API RP 505, NFPA 497 and NFPA 499 define the term "Autoignition Temperature" or (AlT). The term "ignition temperature" is often used synonymously with autoignition temperature, but sometimes incorrectly. This proposal, along with its companion proposals, attempt to promote consistency of the terms between the standards. The term "autoignition temperature" is used when referring to the material property of flammable liquids and vapors, which is consistent with how the term is used in NFPA 497. The term "ignition temperature" is used when referring to the material property of combustible dusts, which is consistent with how the term is used in NFPA

18 14-27 Log #56 NEC-P14 Richard A. Janoski, Finleyville, PA (1) For equipment provided with threaded entries for NPT threaded conduit or fittings, listed conduit, listed conduit fittings, or listed cable fittings shall be used. As 500.8(E)(1) is presented in the 2008 NEC, a grammatical error leaves the conduit fittings and the cable fittings without a rule that requires them to be listed. The word listed is only preceding the word conduit, therefore it only applies to the conduit. The addition of the word listed preceding the conduit fittings, and the cable fittings will add the necessary listing requirement. This will also provide continuity between the proposed text for 500.8(E)(1) and 500.8(E)(2). 18

19 14-28 Log #2467 NEC-P14 Donald W. Ankele, Underwriters Laboratories Inc. Metric threaded entries into explosionproof equipment shall have a class of fit of at least 6g/6H and shall be madeup with at least five threads fully engaged for Group C and Group D, and at least eight threads fully engaged for Group A and Group B. and thread engagement as shown in Table 500.8(E)(3). *** Insert Table 500.9(E)(3) here*** Revise the class of fit to align with the requirements in ANSI standards for explosionproof equipment and to provide gauging requirements for field tapping of entries into unlisted equipment. standards. The panel has determined that it would be best to address this issue in the individual product 19

20 14-29 Log #2370 NEC-P14 James F. Williams, Fairmont, WV Add text to read as follows: (a) (6) In industrial establishments with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons service the installation and where metallic conduit (RMC) does not provide sufficient corrosion resistance, listed reinforced thermosetting resin conduit (RTRC), factory elbows, and associated fittings, all marked with the suffix -XW, and Schedule 80 PVC conduit, factory elbows, and associated fittings shall be permitted. Where seals are required for boundary conditions as defined in (A)(4), the Division 1 wiring method shall extend into the Division 2 area to the seal, which shall be located on the Division 2 side of the Division 1 Division 2 boundary. In each conduit run passing from a Class I, Division 2 location into an unclassified location. The sealing fitting shall be permitted on either side of the boundary of such location within 3.05 m (10 ft) of the boundary. Rigid metal conduit (RMC) or threaded steel intermediate metal conduit shall be used between the sealing fitting and the point at which the conduit leaves the Division 2 location, and a threaded connection shall be used at the sealing fitting. Except for listed reducers at the conduit seal, there shall be no union, coupling, box, or fitting between the conduit seal and the point at which the conduit leaves the Division 2 location. Conduits shall be sealed to minimize the amount of gas or vapor within the Division 2 portion of the conduit from being communicated to the conduit beyond the seal. Such seals shall not be required to be explosion-proof but shall be identified for the purpose of minimizing passage of gases under normal operating conditions and shall be accessible. The cross-sectional area of the conductors permitted in a seal shall not exceed 25 percent of the cross-sectional area of a rigid metal conduit (RMC) of the same trade size unless it is specifically identified for a higher percentage of fill. Pendant luminaires shall be suspended by and supplied through threaded rigid metal conduit (RMC) stems or threaded steel intermediate conduit stems, and threaded joints shall be provided with set-screws or other effective means to prevent loosening. For stems longer than 300 mm (12 in.), permanent and effective bracing 20

21 against lateral displacement shall be provided at a level not more than 300 mm (12 in.) above the lower end of the stem, or flexibility in the form of a fitting or flexible connector identified for the Class I, Division 1 location shall be provided not more than 300 mm (12 in.) from the point of attachment to the supporting box or fitting. Pendant luminaires shall be suspended by threaded rigid metal conduit (RMC) stems, threaded steel intermediate metal conduit stems, or other approved means. For rigid stems longer than 300 mm (12 in.), permanent and effective bracing against lateral displacement shall be provided at a level not more than 300 mm (12 in.) above the lower end of the stem, or flexibility in the form of an identified fitting or flexible connector shall be provided not more than 300 mm (12 in.) from the point of attachment to the supporting box or fitting. "Rigid Metal Conduit" is also referred to as RMC Metallic Conduit Suggest that "RMC" be added to all references. This will make finding all references to "Rigid Metal Conduit" easier and more reliable. There was no technical substantiation provided with the proposal to justify the insertion of the acronym in each location within this article where the wiring method is used. Section of the NEC Style Manual permits, but does not require, an acronym to be used within an article. Adding the acronym to the wiring method does not increase usability or reliability. 21

22 14-30 Log #2398 NEC-P14 James F. Williams, Fairmont, WV Add text to read as follows: (a) (6) In industrial establishments with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons service the installation and where metallic conduit (IMC) does not provide sufficient corrosion resistance, listed reinforced thermosetting resin conduit (RTRC), factory elbows, and associated fittings, all marked with the suffix -XW, and Schedule 80 PVC conduit, factory elbows, and associated fittings shall be permitted. Where seals are required for boundary conditions as defined in (A)(4), the Division 1 wiring method shall extend into the Division 2 area to the seal, which shall be located on the Division 2 side of the Division 1 Division 2 boundary. In each conduit run passing from a Class I, Division 2 location into an unclassified location. The sealing fitting shall be permitted on either side of the boundary of such location within 3.05 m (10 ft) of the boundary. Rigid metal conduit or threaded steel intermediate metal conduit (IMC) shall be used between the sealing fitting and the point at which the conduit leaves the Division 2 location, and a threaded connection shall be used at the sealing fitting. Except for listed reducers at the conduit seal, there shall be no union, coupling, box, or fitting between the conduit seal and the point at which the conduit leaves the Division 2 location. Conduits shall be sealed to minimize the amount of gas or vapor within the Division 2 portion of the conduit from being communicated to the conduit beyond the seal. Such seals shall not be required to be explosion-proof but shall be identified for the purpose of minimizing passage of gases under normal operating conditions and shall be accessible. Pendant luminaires shall be suspended by and supplied through threaded rigid metal conduit stems or threaded steel intermediate conduit (IMC) stems, and threaded joints shall be provided with set-screws or other effective means to prevent loosening. For stems longer than 300 mm (12 in.), permanent and effective bracing against lateral displacement shall be provided at a level not more than 300 mm (12 in.) above the lower end of the stem, or flexibility in the form of a fitting or flexible connector identified for the Class I, Division 1 location shall be provided not more than 300 mm (12 in.) from the point of attachment to the supporting box or fitting. 22

23 Pendant luminaires shall be suspended by threaded rigid metal conduit stems, threaded steel intermediate metal conduit (IMC) stems, or other approved means. For rigid stems longer than 300 mm (12 in.), permanent and effective bracing against lateral displacement shall be provided at a level not more than 300 mm (12 in.) above the lower end of the stem, or flexibility in the form of an identified fitting or flexible connector shall be provided not more than 300 mm (12 in.) from the point of attachment to the supporting box or fitting. "Intermediate Metal Conduit" is also referred to as IMC Metallic Conduit Suggest that "IMC" be added to all references. This will make finding all references to Intermediate Metal Conduit" easier and more reliable. See panel action and statement on Proposal

24 14-31 Log #2468 NEC-P14 Donald W. Ankele, Underwriters Laboratories Inc. Wiring methods shall comply with (A) or (B). (a) In Class I, Division 1 locations, the wiring methods in (a) through (d) shall be permitted. (b) Type MI cable shall be installed and supported in a manner to avoid tensile stress at the termination fittings. (c) where the conditions of maintenance and supervision ensure that only qualified persons service the installation, Type MC-HL cable listed for use in Class I, Zone 1 or Division 1 locations, with a gas/vaportight continuous corrugated metallic sheath, an overall jacket of suitable polymeric material, and a separate equipment grounding conductor(s) in accordance with , and terminated with fittings listed for the application. Type MC-HL cable shall be installed in accordance with the provisions of Article 330, Part II. (d) where the conditions of maintenance and supervision ensure that only qualified persons service the installation, Type ITC-HL cable listed for use in Class I, Zone 1 or Division 1 locations, with a gas/vaportight continuous corrugated metallic sheath and an overall jacket of suitable polymeric material, and terminated with fittings listed for the application, and installed in accordance with the provisions of Article 727. Informational Note: For further information on construction, testing and marking of cables, cable fittings, and cord connectors, see UL 2225,. Where necessary to employ flexible connections, as at motor terminals, flexible fittings listed for the location, or flexible cord in accordance with the provisions of terminated with cord connectors listed for the location, shall be permitted. Informational Note: For further information on construction, testing and marking of cables, cable fittings, and cord connectors, see UL 2225,. All boxes and fittings shall be approved for Class I, Division 1. In Class I, Division 2 locations, the following wiring methods shall be permitted: (1) All wiring methods permitted in (A). (2) Enclosed gasketed busways and enclosed gasketed wireways. (3) Type PLTC and Type PLTC-ER cable in accordance with the provisions of Article 725, including installation in cable tray systems. The cable shall be terminated with listed fittings. (4) Type ITC and Type ITC-ER cable as permitted in and terminated with listed fittings. (5) Type MC, MV, or TC cable, including installation in cable tray systems. The cable shall be terminated with listed fittings. where the conditions of maintenance and supervision ensure that only qualified persons service the installation and where metallic conduit does not provide sufficient corrosion resistance, listed reinforced thermosetting resin conduit (RTRC), factory elbows, and associated fittings, all marked with the suffix -XW, and Schedule 80 PVC conduit, factory elbows, and associated fittings shall be permitted. Where seals are required for boundary conditions as defined in (A)(4), the Division 1 wiring method shall extend into the Division 2 area to the seal, which shall be located on the Division 2 side of the Division 1 Division 2 boundary. 24

25 (2) Flexible Connections. Where provision must be made for limited flexibility, one or more of the following shall be permitted: (1) Listed flexible metal fittings. (2) Flexible metal conduit with listed fittings. (3) Liquidtight flexible metal conduit with listed fittings. (4) Liquidtight flexible nonmetallic conduit with listed fittings. (5) Flexible cord listed for extra-hard usage and terminated with listed fittings. A conductor for use as an equipment grounding conductor shall be included in the flexible cord. Informational Note 1: See (B) for grounding requirements where flexible conduit is used. Revise to add an Informational Note regarding the requirements for cables, cable fittings and cord connectors. There have been several instances of confusion regarding these Code requirements with respect to termination of cables with cable fittings. Accept the addition of two informational notes as follows: Informational Note: For entry into enclosures required to be explosionproof, see further information on construction, testing and marking of cables, explosionproof cable fittings, and explosionproof cord connectors in ANSI/UL , Cables and Cable-Fittings for Use in Hazardous (Classified) Locations. The first addition is intended to follow (A)(3) and the second is intended to follow (B)(4). The text was amended to clarify when the informational note is relevant and relocated to the appropriate sections. The title of the referenced document has been corrected to indicate ANSI approval and the publication date has been added, in accordance with Paragraph of the Regulations Governing Committee Projects Log #2607 NEC-P14 Richard A. Holub, The DuPont Company, Inc. Add new text to read as follows: (e) Fiber Optic cables of the types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall be permitted to be installed in raceways as stated in (A). These Fiber Optic cables shall be sealed in accordance with These proposals are a result of an ad-hoc task team consisting of members of CMP3, CMP14, and CMP16, along with industry representatives. Members of this task team included Rich Holub, Dave Wechsler, Bob Potter, Bob Walsh, Harry Ohde, Terry Coleman, and Will Miller. Section 770.3(A) currently permits the use of Fiber Optic cables in hazardous (classified) locations if sealed in accordance with Sections , , , and This proposal adds the requirements in Chapter 5 for correlation as Chapter 7 is not allowed to modify Chapter 5, per Section Similar proposals are submitted for Articles 502, 505, and 506 accordingly. 25

26 14-33 Log #2962 NEC-P14 Robert L. Seitz, Artech Engineering Modify existing text. (1) General. In Class I, Division 1 locations, the wiring methods in (a) through (d)(e) shall be permitted. Add new text. (e) In industrial establishments with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons service the installation, and where the cable is not subject to physical damage,shipboard Cable with braided metallic armor, that complies with the crush and impact requirements of Type MC-HL cable and is identified for such use with the marking, a separate equipment grounding conductor(s) in accordance with , and terminated with fittings listed for the application. Braided armor Shipboard cable, shall be installed in accordance with the provisions for TC-ER cable found in Article336. Power cables of smaller conductor size, shielded pairs and triads and control cables with small number of conductors are often connected to devices that must be removed or moved to permit maintenance activities to be performed, or for alterations to process piping. A cable that has greater flexibility than MC-HL would benefit this activity as the MC-HL cable cannot be moved out of the way of the work area sufficiently, so is generally subject to damage by the work effort that take place. A more flexible cable installed in small size wire basket tray can be moved further out of the way than can conduit or MC-HL installation. Line (pipe) mounted devices are subject to movement as pipes expand and contract with temperature changes and to vibration caused by pumps and flow through the lines, so flexibility better than that provided by MC-HL cable or MI cable is needed. NEC (B) requires MC (thus MC-HL) cable to be supported within 12 inches of cable termination when cable has 4 or fewer conductors no larger than 10awg, which is often very difficult to provide support at line mounted devices. While extra hard usage cord is permitted where flexible connection is required, the extra hard usage cord is not available in configurations with shielded pairs or triads or for controls connections to valves and other devices. So a flexible cable type is necessary that will satisfy the needs for instrumentation and control. MC-HL has severe requirements imposed as it can be installed outside of cable tray, and as not continuously supported. If braided armor Shipboard cable is installed, generally, in cable tray and otherwise continuously supported, with up to 6 ft unsupported between cable tray and utilization equipment it would be well protected for its length and exposed no more than would extra hard usage cord. Permitting braided armor Shipboard cable would not decrease the safety of Class I, Zone 1 electrical installations and would enhance the maintainability, simply some installations, reduce risk of damage to cables during work around within the facilities where it is used. Braided armor shipboard cable is not a wiring method that is permitted in Chapter 3. The substantiation identifies cable of smaller conductor size, but the proposed language does not limit the conductor size. The wording of the proposal is confusing with respect to marking. The substantiation references Zone 1 locations, yet the proposed wording is for Division 1 locations. Panel 14 recommends a multi-panel task group, to include Panel 6 and/or Panel 7, to address the submitter's concerns. 26